Consider 500psi of fluid pressure at one 4-piston caliper.
With 1.38 pistons, the force exerted on the pads is 2960lb. total. With 1.75 pistons, the force exerted on the pads is 4800lb. total.
It would seem that way but it isn't; when computing the clamping force of multi-piston rigid calipers you only use half the caliper pistons. IOW, only one side applies force, the other side acts as a backup. I know this is counterintuitive but that's the way it is.
